Microstructures, Electrical, Thermal, and Mechanical Properties of Bulk Ti2AlC Synthesized by Self-Propagating High-Temperature Combustion Synthesis with Pseudo Hot Isostatic Pressing


  • This work was supported by the Major Research Plan of the National Natural Science Foundation of China for Xiaodong He (Grant No. 90816005). Chuncheng Zhu would also like to acknowledge the support of National Natural Science Foundation of China (Grant No. 51172057).

Author to whom correspondence should be addressed. e-mails: hexd@hit.edu.cn (Xiaodong He), baiyl@hit.edu.cn and baiyl.hit@gmail.com (Yuelei Bai)


The microstructure and the electrical, thermal, and mechanical properties of bulk Ti2AlC synthesized by self-propagating high-temperature combustion synthesis with pseudo hot isostatic pressing (SHS/PHIP) were investigated in detail. The plate-like Ti2AlC grains distribute irregularly, with the grain size of around 6 μm in length and 1 μm in width. With increasing temperature, the electrical resistivity increases linearly from room temperature (RT) to 900°C, but the thermal conductivity decreases slightly. The RT electrical resistivity and thermal conductivity are 0.40 ± 0.03 μΩ·m and 27.0 W·(m·K)−1, respectively. The electronic component of the thermal conductivity is the dominant mechanism at all temperatures, and the phonon contribution almost can be neglected above 873 K. With increasing temperature, the flexural strength increases first, then decreases above 550°C, at which it reaches the maximum value of 539 ± 36 MPa. The brittle-to-plastic transition temperature falls in the temperature range of 750°C–950°C. The Ti2AlC synthesized by SHS/PHIP process exhibits an anisotropic compressive strength. The work of fracture of Ti2AlC is estimated to be 200 ± 7 J/m2, which is much higher than that of traditional ceramics.